Recent Posts
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Java – sonar flag “bad practice”: if the class is extended, it may not be safe to use getresource in XYZ
Sonar pointed out this error in our java project Welcome any suggestions on safe programming! URL url = getClass().get…… -
Java – when should I use inputstreamreader and outputstreamwriter?
From the Java Tutorial site, we know that inputstreamreader and outputstreamwriter can convert streams between bytes a…… -
Java – is there a way to expose hibernate entities as restful resources without dto?
I'm developing a simple webapp that exposes the domain model as a restful resource When grouping hibernate entities in…… -
Java – return try block in block vs return block
I have a try statement in a small static method. Is there a best practice for where I should return? try { mightTh…… -
Java – understand the last value and value returned by try catch
I have the following code public static void main(String[] args) { System.out.println(returnString()); } private s…… -
java – EJB3 / JPA @Transactional
Is there an EJB or JPA annotation equivalent to spring's @ transactional? Solution The equivalent EJB 3 attribute is j…… -
Java – generic type parameters depend on itself
I encountered the following situations: I understand this: In the type parameter part of the class, if s is the bounda…… -
Java – anonymous variable (?) Advantages?
I want to know something suddenly came to my mind yesterday We can do this (in Java): ObjA instanceA = new ObjA(); Obj…… -
How to create a linked list array in Java?
So I need to input the edges of a bipartite graph like this: 6 1 3 1 2 1 5 2 7 2 4 2 9 The first number is the number …… -
What time do you use the Callable object to call call () in Java Executor?
Here are some sample code for example What I need to know is when calling call () on calllable? What triggered it? pub…… -
java – Calendar. What does undecimber do?
The calendar class has a constant named undefcimber It describes the 13th month Is this constant useful? In Wikipedia,…… -
Java – beannotofrequiredtypeexception, but it is actually a $proxy type
I need help with spring and proxy issues Webapp project – > Spring context <context:annotation-config/> <c…… -
JAVA_ Home is not defined correctly (only from Jenkins)
Tried to set Jenkins, but my build failed: $ant test Error: JAVA_HOME is not defined correctly. We cannot execute /u…… -
Programming languages – why are closures suddenly useful for optimizing programs to run on multiple cores?
I read an article claiming that closure (or "block") is a useful weapon in "multi-nuclear war", because Now, I'm not t…… -
Java – primitive types and in generics Differences between
It may be asked somewhere, but I can't find it Please tell me the exact difference between the two: ArrayList list = n…… -
Java – identify swing components on specific screen coordinates? (and manually schedule mouseevents)
I'm working on some Java applications that are compatible with alternative input devices Unfortunately, the device in …… -
Java – is there any way to use secondarytable to jump multiple tables?
Suppose I have a main user table named userprofile and a display name I have various modules. You can use userprofile …… -
How do I synchronize from two processes – atomic writes on one file?
I have two processes. Each process writes big data buffer. I want to control the synchronization of these processes to…… -
Java – add multiple jpprogressbars to the tablecolumn of JTable
I have added multiple jpprogressbars to the tablecolumn of JTable After some calculations, I'm updating all jpprogress…… -
How to use java to control the LED lights connected to PC through USB / SerialPort, etc? What equipment should I use?
I want to write a program in Java, which can control the LED light to connect to the "thing" connected to the computer…… -
Is there a standard option or nullable class in Java?
Nullable (c#) has some different meanings, but in any case, option (Scala) and nullable can be used to express the con…… -
Java – how to read line by line using FileReader
Thank you for your attention I created a program and I am using the login form and registration form Once users regist…… -
Java – use transferhandler to drag jlabel (drag and drop)
I'm using the transferhandler to transfer data from JPanel to jtextarea as a jlabel (click somewhere in the left panel…… -
Java – what makes HashMap Putifabsent is faster than containskey?
topic How can the HashMap method putifabsent conditionally execute put faster than before calling containskey (x)? For…… -
Java – is there an SQL syntax aware swing component?
I'm looking for some Java Swing components (like textarea) that know SQL syntax - which means it can recognize and hig…… -
Java commons cli with options for a list of possible values
Xinxin banner Xinxin 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 2…… -
Java – valueeventlistener childeventlistener for recyclerview in Android
Firebase database users know that there are two basic listeners for listening to data: valueeventlistener and childeve…… -
Java – how to inject beans using EJB 3.1 before the class constructor runs?
I have a facade with persistence units I need the facade and initialize its dependencies before the rolecontroller con…… -
Get the real file extension – Java code
For security reasons, I want to determine the real file extension How can I do this? Solution If you really want to ge…… -
java – . Messages in the properties file do not display UTF-8 characters
As the title indicates, I can only add that if I enter it manually in the HTML file ąę It doesn't matter View parser: …… -
Which is more suitable for java development Hosting: aptana? Google App Engine？ Slice host?
I'm divided into the benefits of developing Java (non-commercial) web applications and deploying to aptana or Google c…… -
Call mongodb function from Java
I'm trying to call stored JavaScript functions from the mongodb Java driver I have been following this guide to store ……